The Syrian government said that Washington's recognition Monday of Israeli claims over the occupied Golan Heights were a blatant attack on its sovereignty.
President Donald Trump on Monday signed a proclamation recognising Israeli sovereignty over the disputed Golan Heights, a border area seized from Syria in 1967.
Israeli Prime Minister Benjamin Netanyahu called the recognition "historic" and said the Golan Heights, which are still claimed by Syria, would remain permanently under Israeli control.
The move, which breaks with decades of international consensus, drew criticism from the Syrian government.
"In a blatant attack on the sovereignty and territorial integrity of Syria, the president of the US has recognised the annexation of the Syrian Golan," a foreign ministry source said, according to state news agency SANA.
"Trump does not have the right and the legal authority to legitimise the occupation," he said.
The unnamed source also said the unlimited support the US gives to Israel makes Washington the prime enemy of the Arabs, according to SANA.